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参数资料
| 型号： | FAN6862RTY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR GREEN MODE 6-SSOT |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 62kHz ~ 68kHz |
| 输入电压： | 9.5 V ~ 24 V |
| 功率（瓦特）： | 300mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | * |
| 包装： | 标准包装 |
| 其它名称： | FAN6862RTYDKR |
Protections
Self-protective functions include V DD Over-Voltage
Protection (OVP), Open-Loop / Overload Protection
(OLP), Over-Current Protection (OCP), Short-Circuit
Protection, and Over-Temperature Protection (OTP).
FAN6862R uses auto-restart mode protections and
FAN6862L uses latch-mode protections.
Auto-Restart Mode Protection: Once a fault condition
is detected, switching is terminated and the MOSFET
remains off. This causes V DD to fall because no more
power is delivered from auxiliary winding. When V DD falls
to V DD-OFF (8.5V), the protection is reset and the
operating current reduces to startup current, which
causes V DD to rise. FAN6862R resumes normal
operation when V DD reaches V DD-ON (16V). In this
manner, the auto-restart can alternately enable and
disable the switching of the MOSFET until the fault
condition is eliminated ( see Figure 25 ).
Open-Loop / Overload Protection (OLP)
When the upper branch of the voltage divider for the
shunt regulator (KA431 shown) is broken, as shown in
Figure 26, no current flows through the opto-coupler
transistor, which pulls up the feedback voltage to 5.2V.
When the feedback voltage is above 4.6V longer than
56ms, OLP is triggered. This protection is also triggered
when the SMPS output drops below the nominal value
longer than 56ms due to the overload condition.
Latch-Mode Protection:
Once this protection is
triggered, switching is terminated and the MOSFET
remains off. The latch is reset only when V DD is
discharged below 4V by unplugging AC power line.
Figure 26. OLP Operation
V DD Over-Voltage Protection (OVP)
V DD over-voltage protection prevents IC damage caused
by over voltage on the VDD pin. The OVP is triggered
when V DD reaches 25V. A debounce time (typically
30μs) prevents false triggering by switching noise.
Over-Temperature Protection (OTP)
The OTP circuit is composed of current source and
voltage comparators. Typically, an NTC thermistor is
connected between the RT and GND pins. Once the
Figure 25. Auto-Restart Operation
Over-Current Protection (OCP)
FAN6862R/L has over-current protection thresholds. It is
for pulse-by-pulse current limit, which turns off the
MOSFET for the remainder of the switching cycle when
the sensing voltage of MOSFET drain current reaches
the threshold. The other threshold is for the over-current
protection, which shuts down the MOSFET gate when
the sensing voltage of MOSFET drain current is above
the threshold longer than the shutdown delay (56ms).
? 2009 Fairchild Semiconductor Corporation
FAN6862R/L ? Rev. 1.0.1
11
voltage of this pin drops below a threshold of 1.02V,
PWM output is disabled after t DOTP debounce time. If this
pin drops below 0.7V, it triggers the latch-off protection
immediately after t DOTP2 debounce time.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6862TY | 功能描述:电流型 PWM 控制器 Hi -Integrated Green Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN6862WLTY | 功能描述:电流型 PWM 控制器 Green Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN6862WRTY | 功能描述:电流型 PWM 控制器 Green Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN6862WTY | 功能描述:电流型 PWM 控制器 Low Power Two-Input Logic Gate TinyLogic RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN6863 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
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